JavaConfig 在 java 中配置 bean

Spring3.0开始 ，@Configuration用于定义配置类，可替换xml配置文件，
配置类内部包含有一个或多个被@Bean注解的方法， 
AnnotationConfigApplicationContext或AnnotationConfigWebApplicationContext 

配置类引用 其他配置类 或 xml 配置
@Import(TestConfiguration.class)
@ImportResource("classpath:applicationContext-configuration.xml")


Bean1 添加 @Component 
Bean2 在 Config2中定义
Bean3 在 Config3中定义



Bean1.java 


@Component
public class Bean1{	
	public Bean1(){
		System.out.println(this+" create "+new Date());
	}
}



Config2.java

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class Config2{
	 @Bean
	 public Bean2 bean2(){
		 return new Bean2();
	 }
}



Config1.java

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ComponentScan.Filter;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;

// @ComponentScan(useDefaultFilters = false,includeFilters = {@Filter(type = FilterType.ANNOTATION, value = Component.class)})
// @ComponentScan(useDefaultFilters = false,includeFilters = {@Filter(type = FilterType.CUSTOM, value = MyTypeFilter.class)})
@ComponentScan(useDefaultFilters = true,excludeFilters = {@Filter(type = FilterType.ANNOTATION, value = Configuration.class)})
@Configuration
public class Config1{
		
}



Hello.java

// AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(Config1.class);
AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();

ctx.register(Config1.class);	
// ctx.register(Config2.class);
// ctx.register(Config3.class);
ctx.refresh();


Config1 中 使用 @ComponentScan ，才能扫描到 Bean1  Config2  Config3
排除对  Config2  Config3 的扫描

@ComponentScan(useDefaultFilters = true,excludeFilters = {@Filter(type = FilterType.ANNOTATION, value = Configuration.class)})


完整代码
https://gitee.com/dyyx/hellocode/tree/master/project/springtest/src/main/java/dyyx/javaconfig